Adhesive composition and method of adhering waxed surfaces



' cess of 50% isp'referred.

Patented Apr. 10, 1945 I ADHESIVE COMPOSITION AND METHOD OF ADHEBING SURFACES James B. Pardon, Akron, Ohio, assignor The B. F. Goodrich Company, New York, N. Y., a corporation oi New York No Drawing. Application April 7, 1941, Serial No. 387,265

Claims. (01. 154-40) This invention relates to adhesive compositions and particularly to a novel adhesive com- A position especially adapted for adhering together sheets of waxedpaper and similar materials.

Much work has been done in an eiiorttc provide a satisfactory adhesivefor securely bonding together sheets of waxed paper'and the like but v no entirely satisfactory adhesive has been produced prior to the present invention. I have discovered that waxed paper and similar materials may be adhered together securely and firmly by means otan adhesive composition having as its essential constituents an aqueous dispersion of rubber and com syrup. The corn syrup may be added to the aqueous dispersion of rubber in widely varying proportions but preferably in proportions varying from parts.

to 35 vparts by weight. of corn syrup per 100 parts by weight of the aqueous dispersion of rubber. Best results are obtained when irom '20 to parts by weight of corn syrup are added to her. It is also. desirable to add to the adhesive composition a minor proportion of a wetting agent to facilitate spreading of, the composition on the waxed surface. jordinarily, no more than The wetting agent used in the preferred compositions may be any of the numerous wetting agents now commonly sold and used in latex compositions. For example, the commercial product known as Aquarex D" is very satisfactory. Aquarex D is understood to consist principally of sodium lauryl sulfate.

A typical adhesive composition adapted for adhering waxed paper'may be prepared by thoroughly mixing 100 parts by weight of ammbnia preserved, centrifugally concentrated latex containing 60% total solids together with 25 parts byweight of light Karo syrup and 2 parts by weight of Aquarex D."

In using such a composition to adhere sheets of waxed paper together, one face of each sheet each l00'parts of the aqueous dispersion of rubfor a short time.

to be adhered is lightly coated with a film of.

the liquid adhesive composition and the composition is then dried until substantially all the water is driven therefrom. This may be accomplished by drying at room temperature or by subjecting to mild heat,. for example, 150 F.

are then pressed into intimate contact and al- 25 lowed to dry further by standing under ordinary 10' parts vby'weight oi such wetting agent should be used for each 100 parts by weight of the aqueous dispersion of rubber. The composition desirably should be substantially free of ingredients other than those herein mentioned. The aqueous dispersion of rubber may be any naturally occurring or artificially prepared col-. loidaldispersion 01' natural or synthetic rubber in a watery medium containing the usual net-- urally occurring .or artificially added protective colloids, preservative-a stabilizing agents or similar conditioning agents. Any of the. common agents for vulcanizing. rubber also maybe included in. the composition .when a vulcanized bond is desired. Preferably, however, the aqueous dispersion should be natural rubber latex, and

superior adhesive compositions are obtained when a concentrated latex is used. Concentrated latex having a total solids content inex- The com syrup used in.the' present invention" conveniently may be the' commercial household product sold uner the trade name Karo syrup.-

Either the lightor'thedark variety oi. corn syrup may be used without materially eil'ecting the; adhesive characteristics of the composition.

The light syrup ordinarily is preferred, however,

where a dark color in the adhesive would be undesirable.

may be efl'ected without departing from the room conditions. The two sheets of waxed paper will be adhered together securely and firmly and the bond. will have long lasting qualities.

1 Numerous modifications and variations in details of the invention as hereinbefore described spirit and scope of the invention as defined by the appended claims.

I claim: I v p 1-. An adhesive for waxed paper and the like,

' said adhesive, comprising a. free-flowing liquid composition having an aqueous continuous phase andv containing an aqueous dispersion of rubber and corn syrup, the corn syrup being present in .15 to parts by weight'per 100 parts oithe.

a quantity corresponding substantially to from aqueous dispersion.

2.' An adhesive for waxed paper and the like,

said adhesive comprising a free-flowing liquid and containing natural rubber latex and corn composition having an aqueous continuous phase syrup, the corn syrup being present in a quantity corresponding substantially to from. 15 to 35- 'parts by weight per parts of the latex.

3. An adhesive for waxed paper and the like,

said adhesive comprising a free-flowing liquid composition having an aqueous continuous n and containing. natural rubber latex having a 1 total solids content'in' excess'ot 50% and 0m syrup in a quantity corresponding substantially The adhesive coated surfaces to from .15 to 35 parts by weight per 100 parts of the latex.

4. An adhesive for waxed paper and the like, said adhesive comprising a free-flowing liquid composition having an aqueous continuous phase and containing 100 parts by weight of natural rubber latex and from 20 to 25 parts by weight of corn syrup.

5. An adhesive for waxed paper and the like, said adhesive comprising a free-flowing liquid composition having an aqueous continuous phase v and containing 100 parts by weight of concentrated natural rubber latex having at least 50% total solids content and from 20 to 25 parts by weight of corn syrup.

6. An adhesive for waxed paper and the like, said adhesive comprising a free-flowing liquid composition having an aqueous continuous phase and containing an aqueous dispersion of rubber, corn syrup, and a wetting agent, the corn syrup being present in a quantity corresponding substantially to from 15 t 35 parts by weight per 100 parts of the aqueous dispersion of rubber.

7. An adhesive for waxed paper and the like, said adhesive comprising a free-flowing liquid composition having an aqueous continuous phase said adhesive comprising a free-flowing liquid composition having an aqueous continuous phase and containing 100 parts by weight of concenand containing 100 parts by weight of concentrated natural rubber latex, 15 to parts by weight of corn syrup, and not more than 10 parts by weight of a wetting agent.

8. An adhesive for waxed paper and the like,

trated natural rubber latex having a total solids content in excess of from 20 to 25 parts of corn syrup, and not more than 10 parts by weight of awetting agent.

9. The method of adhering a waxed surface to another surface which comprises coating the waxed surface with a free-flowing liquid adhesive composition having an aqueous continuous phase and comprising an aqueous dispersion of rubber as a principal ingredient and corn syrup in a quantity corresponding substantially to from 15 to 35 parts by weight per parts of the aqueous dispersion of rubber, drying the adhesive thereon, and pressing the adhesive-coated surface into intimate contact with the other surface.

10. The method of adhering a waxed surface to another surface which comprises coating the waxed surface with a free-flowing liquid adhesive composition having an aqueous continuous phase and comprising natural rubber latex as a principal ingredient and corn syrup in a quantity corresponding substantially to from 15 to 35 parts by weight per 100 parts of the latex, drying the adhesive thereon, and pressing the adhesivecoated surface into intimate contact with the other surface.

' JAMES R. PURDON. 

